Nestlé, Mars and Hershey have been accused of breaking pledges to stop using “conflict palm oil” from deforested Indonesian jungles, just days before the annual Halloween confectionery frenzy.

The Rainforest Action Network (RAN) says consumers have been “deceived” by promises from the brands to clean up their supply chains which were subsequently delayed, revised or watered down.

Laurel Sutherlin, a spokesman for the group, told the Guardian: “For too many years, Nestlé, Mars and Hershey have cherry-picked their [palm oil] targets and then moved the goalposts when they don’t achieve them. There’s just no further room for error to prevent the extinction of tigers, orangutans and elephants.”

“Four years later we can now trace over 90% of our palm oil back to the mill of origin and almost two thirds back to the plantation level,” said Nestlé spokeswoman Peggy Diby. “Our ambition is to raise this figure to 100% by 2020, back to plantation.”

In July, Nestlé told the Guardian it could only source 47% of its palm oil to plantations, suggesting a big improvement in the last three months.

Hershey’s said in 2014 that it would source all of its palm oil back to the mill level by 2015, and to plantations by 2016. But its plantation level sourcing actually fell in 2016 from 27% to 14%, and the commitment has been deferred until 2020.

Jeff Beckman, Hershey’s communications director said: “While we remain deeply committed to pushing all stakeholders to accelerate traceability and bring full transparency to this supply chain along with our supplier partners, we realised it would take more time to achieve this goal than originally anticipated.”

Mars had promised to cut conflict palm oil out of its supply chain by 2015. A spokesperson said: “Our traceability levels remain high. In the year to date, 97% of our palm oil is traceable to mill level and 40% traceable to the plantation. The evidence of the challenge in Leuser is clear, and we are already taking steps toward action.”

Gemma Tillack, Ran’s campaign director said: “It is our view that the brands have deceived consumers by continually claiming to be tackling deforestation when they have not executed the actions required to achieve a moratorium on the forest frontlines of their global supply chains.”

• This article was amended on 30 October 2017 to include a response from Mars, which was supplied after publication.